The ‘Alexa Look’ “Alexa 外观”

A lot of Mavic 3 (Pro/Cine) users have emailed me describing their dissatisfaction with the colours coming out of it’s camera. Having recently purchased a Mavic 3 myself I decided to develop a LUT to emulate my Alexa Mini using the tried and true process I developed with Sony, Canon and Blackmagic cameras. While no camera is perfect, personally I find the Alexa’s colour science to be the gold standard in terms natural, accurate and beautiful colours right out of the box as a starting point to grade from.
许多 Mavic 3（Pro/Cine）用户给我发电子邮件，表达了他们对其相机色彩的不满。最近我自己购买了 Mavic 3，我决定开发一个 LUT 来模拟我的 Alexa Mini，使用我在索尼、佳能和 Blackmagic 相机上开发的经过验证的流程。虽然没有完美的相机，但我个人认为 Alexa 的色彩科学是开箱即用的自然、准确和美丽色彩的黄金标准，可作为分级的起点。

Over the course of a few days, I shot exposure matched test footage with my Alexa Mini and a Mavic 3 (Pro/Cine) side by side. I shot in sunlight, shadow, overcast, indoor daylight, indoor mixed lighting, controlled studio lighting and all with my trusty Xrite Colour Checker Classic Card and my Xrite Digital Color Checker SG Card.
在几天的时间里，我用 Alexa Mini 和 Mavic 3 (Pro/Cine) 并排拍摄了曝光匹配的测试片段。我使用值得信赖的 Xrite Color Checker Classic 卡和 Xrite Digital Color Checker SG 卡在阳光、阴影、阴天、室内日光、室内混合照明、受控工作室照明等条件下进行拍摄。

In total I shot approximately 80 scenes this way. With each set up I recorded 3 exposures – under 2 stops over 2 stops and correct exposure. With the extensive data gathered, I was able to build an emulation that is extremely accurate; factoring in not just the overall colour response but also the more subtle aspects of the Alexa colour science that it borrowed from photochemical film such as it’s non linear hue responses for rich, complex colours, subtractive colour modeling in relation to luminance vs saturation dynamics and the Alexa’s overall saturation profile for beautiful highlight rolloff and shadow falloff to name a few.
我用这种方式总共拍摄了大约 80 个场景。对于每个设置，我记录了 3 次曝光 – 低于 2 档超过 2 档以及正确的曝光。通过收集大量数据，我能够构建极其准确的仿真；不仅考虑整体颜色响应，还考虑了 Alexa 颜色科学的更微妙的方面，它借鉴了光化学胶片，例如丰富、复杂颜色的非线性色调响应、与亮度与饱和度动态相关的减色模型以及Alexa 的整体饱和度曲线可实现美丽的高光衰减和阴影衰减等。

These LUTs are designed to deliver:
这些 LUT 旨在提供：

1) An organic, smooth and gentle highlight roll-off that mimics Alexa in it’s highlight rendering to give an overall organic and naturalistic feel to the footage.
1) 有机、平滑、柔和的高光滚降，模仿 Alexa 的高光渲染，为镜头带来整体有机和自然的感觉。

2) Natural skin tones designed to render contrast levels on skin like an ARRI Alexa.
2) 自然肤色，旨在像 ARRI Alexa 一样呈现皮肤对比度。

3) Naturalistic, organic and classic colours.
3) 自然、有机和经典的色彩。

4) Rich but not crushed shadows so that these LUTs can be used in low light scenes as well as broad daylight.
4) 阴影丰富但不破碎，因此这些 LUT 可以在低光场景和光天化日下使用。

5) Commensurate exposure levels with the input footage that don’t shrink the dynamic range of the camera (by blowing out the highlights and crushing the shadows) or radically change the exposure value or luminance of the originating image.
5) 与输入素材相匹配的曝光级别，不会缩小相机的动态范围（通过消除高光并压碎阴影）或从根本上改变原始图像的曝光值或亮度。

The 5 LUTs Described Below:
下面描述了 5 个 LUT：

LUT 1) Neutral – A neutral ARRI look – no colour cast or ‘look’ – just the classic ALEXA Rec709 look.
LUT 1) 中性 – 中性 ARRI 外观 – 无色偏或“外观” – 只是经典的 ALEXA Rec709 外观。

LUT 2) Tungsten – A slightly warmer golden cast designed to be utilised for subjects bathed in tungsten light. 
LUT 2) 钨丝灯 – 稍微温暖的金色铸件，设计用于沐浴在钨丝灯下的主体。

LUT 3) Ice Blue – Blue, colder cast with punchy, deep blues (looks amazing on subjects with blue eyes).
LUT 3) 冰蓝色 – 蓝色，较冷的色调，带有强烈的深蓝色（在蓝眼睛的拍摄对象上看起来很棒）。

LUT 4) Jamaica – Green and gold cast – distinctive, rich, filmic greens and beautiful golden skintones.
LUT 4) 牙买加 – 绿色和金色铸件 – 独特、丰富、电影般的绿色和美丽的金色肤色。

LUT 5) Utopia – the most filmic look of the LUTs, with blood red reds and filmic blues and greens. It’s my personal take on what Utopia would look like.
LUT 5) Utopia – LUT 中最具电影感的外观，具有血红色和电影般的蓝色和绿色。这是我个人对乌托邦的看法。